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Goodwill and Other Intangible Assets - Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Indefinite Lived Intangible Assets |  |
Net carrying amount of unamortized indefinite lived intangible assets | $ 755.1 | $ 767.4
WM Advisors, Inc. |  |
Indefinite Lived Intangible Assets |  |
Net carrying amount of unamortized indefinite lived intangible assets | $ 608.0 | $ 608.0

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